In Figure 25, the customer carrier in AS 21 can configure one instance of LDP for all routers in AS 21 instead of using full-mesh IBGP.
Figure 25: Carrier-of-Carriers Example
In general, if there are a limited number of customer carrier sites and few internal routes in the customer carrier AS, it is simpler and quicker to use LDP than to configure a full IBGP mesh.
An instance of LDP operates essentially in the same way as a master instance. Each instance of LDP must be enabled on all the desired interfaces and a separate set of LDP data structures are maintained for each instance. Instance information includes a set of LDP interfaces, neighbors, sessions, and databases.
For more information about carrier-of-carriers VPNs, see the JUNOS VPNs Configuration Guide.
For more information about LDP, see the JUNOS MPLS Applications Configuration Guide.
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